Stressed with MIL

I am a first time mother who just gave birth few days ago… I feel so stressed up with my MIL who would force me to breastfeed my baby and she would literally comment on everything i do. I have a hard time latching and i could only pump milk which is so tiring mentally and physically and the comments from my MIL stress me up even more. Is it so wrong to give baby formula milk? What should i do :( #advicepls